Display sign base



FIG. 1 is a top, front, left side perspective view showing my new design;

FIG. 2 is a bottom, back, right side perspective view of the design of FIG. 1;

FIG. 3 is a top view of the design of FIG. 1;

FIG. 4 is a bottom view of the design of FIG. 1;

FIG. 5 is a front view of the design of FIG. 1;

FIG. 6 is a back view of the design of FIG. 1;

FIG. 7 is left side view of the design of FIG. 1; and,

FIG. 8 is a right side view of the design of FIG. 1. 

CLAIM The ornamental design for a display sign base, as shown. 